Diacetylene Polymerization Kinetics.- Solid State Photopolymerization of Diacetylenes.- Photopolymerization Reaction Intermediates in Diacetylene Crystals.- Structural Study of the Topochemical Polymerization of Two Diacetylenes.- Microstructures and Polymer Chain Length in Diacetylene Single Crystals.- X-Ray Topographic Studies of the Solid-State Polymerization of PTS[2,4-Hexadiyne Diol Bis(p-Toluene Sulphonate)].- Electronic Structure of Conjugated Polymers.- Theoretical Exciton and Polariton Spectra of Polydiacetylenes.- Ab Initio Studies on Polyynes and Polydiacetylenes: Structure and Harmonic Force Field.- Structural Dependence of the Longitudinal Electric Polarizability of Finite Polyene Chains: An ab Initio Study.- Electrical Transport and Doping of Polydiacetylenes.- The Ultra High Electron Mobility on Polydiacetylene Chains: The Theory.- Electron Motion in Polydiacetylene: The Facts.- Electric Field Dependence of Diffusion and Trapping in Polydiacetylene.- The Study of Electronic Excitations of Polydiacetylenes by Optical and Resonance Raman Spectroscopy.- Electric-Field Sensitive Defect States in Fully and Partially Polymerized PTS.- Spectroscopic Studies of a Diacetylenic Surfactant.- Optical Properties of Polyacetylene.- Spectroscopy and Kinetics of a Planar-Nonplanar Conformational Transition in Polydiacetylene Solutions.- Polydiacetylene Macromolecules in Solution: Rods, Coils and Gels.- 1,4-Diphenylbutenyne: A Model Compound for Polydiacetylenes (PDA).- Toward Polydiacetylenes as Utile Optical and Electronic Elements.- Electric Field Induced Optical Second Harmonic Generation and Polarization Effects in Polydiacetylene Films.- Third Harmonic Generation and Two Photon Absorption in a Polydiacetylene Solution.- Mechanical and Structural Properties of Polydiacetylenes.- Polymerized Diacetylene Monomers in Monolayer and Multilayer Films, Characterization and Possible Applications.- Diacetylenic Phospholipid Polymers.- Homoepitaxy and in-Plane Anisotropy in Langmuir-Blodgett Films.- Working Group Reports.